SFR derivation from [O II] using Kennicutt (1998) and a reddening correction. Left panel: [O II]/Hα ratio (assuming Hα = 2.86Hβ) as a function of the color excess, without (red) and with (blue) dust attenuation correction; the continuous lines represent the average ratio. Right panel: SFR derived from [O II] using the Hα calibration of Kennicutt (1998) and the attenuation-corrected [O II]/Hα ratio. For VIPERS and GSWLC, the slope increases in comparison with the direct [O II] calibration, but the scatter decreases (mean of 0.01 dex and scatter of 0.17 dex for VIPERS, 0.12 and 0.22 dex for GSWLC).